· Michael Blair
Seamless aluminium covers most Nashville houses well. The variables that actually affect how long a gutter lasts are its thickness and whether it has seams, not usually which metal it is.
Gauge matters more than metal
Aluminium comes in different thicknesses, and the thinner grades dent from a ladder, sag when full and deform under an ice load. The heavier gauge costs modestly more and lasts considerably longer.
Ask which thickness is quoted. It is the specification most often left unstated and the one that most affects durability.
Seamless versus sectional
Seamless gutter is rolled on site to the length of the run, so the only joints are at corners and outlets. Every seam is a future leak, so fewer is better.
Sectional gutter is cheaper and DIY-friendly, and in Middle Tennessee’s freeze-thaw cycles the joints work loose over time.
- Heavier gauge aluminium over thin
- Seamless over sectional wherever possible
- Hidden hangers screwed to the fascia, not spike-and-ferrule
- Copper for appearance and longevity at a premium
- Steel where impact resistance matters
Copper and steel
Copper lasts a very long time, develops a patina many people want, and costs several times aluminium. It suits period homes where appearance justifies it.
Galvanised or galvalume steel is stronger than aluminium and resists denting, but the coating decides its life and cut edges are where it starts.
Hangers and fascia
Hidden hangers screwed into the fascia hold far better than the old spike-and-ferrule method, which works loose as wood expands and contracts.
If the fascia is soft or rotted, replacing gutters onto it is throwing money away. Check that before ordering.